Background Music is one of the biggest aspects there is to theming. It's also one of the common aspects of theming the GP pays attention to, as they kind of have to unless they're deaf. Not only that, if you can convey a typically unknown type of music to the GP they suddenly become interested and it is all but proven to stay in their memories longer due to its uniqueness. I find this a lot in the GP. My friends, whenever they hear something classical, or something European like they will verbally admit that it reminds them of Busch Gardens. That is the kind of connection you want your visitors to feel, something that will draw their minds back to the place, that will remind them of their memories and experiences at the park.
With that being said, I have brought multiple friends back to Busch Gardens to experience the LR re-theme in Banbury. Only occasionally did I get a comment on the millions of tacky Union Jacks, the plywood bus or neon colors. But every time someone asked "what the heck are they playing?!" Banbury especially was one of the park's soundtracks that is most memorable and known among the GP. When you take away something as notorious as that and do a complete 180 to playing rock music, you are taking away people's memories, you are robbing them of what they loved and remembered about the park and replacing it with memories they can hear on the radio. Suddenly, the park will no longer become special or distinct and soon they will loose the one thing that always made them recall the times they cherished at the park.
I can assure you the park doesn't play Euro pop or rock or whatever in any other country outside of Banbury. Aquitaine has lyricals, and having weekly Culture lessons in French and commonly listening to different genres of French music, nothing they play in Aquitaine is derived from the current popular culture music. Does that mean I completely accept it? No, not really. In my opinion during the main season hamlet music should only be instrumental. No background music during the main season should ever play such a big role as to being lyrical, it's too distracting and in your face whereas instrumental is in the background and lightly playing a role in your experience, but is still prominent. For this reason I see Banbury Cross(2014), Aquitaine, Killarney, and New France to have the most un-fitting and ill-chosen Hamlet music.
There's also a problem with New France that it seems to be the same two or three songs playing all the time.